Wonder how many simple carbs from sugar and highly refined grains were on the Vegan diet? Most vegans I know only eat vegetables, fruits and natural grains. Nothing animal related at all, which cuts out practically all jumk carbs.
Good rule of thumb: When you cook, your ingredients shouldn't have ingredients.
Animal products have no carbs at all (except for milk which has milk-sugar). I think you meant to say "junk calories".